![]() ![]() ![]() The NullPointerException is thrown for different scenarios, for example, if you call the instance method of an object which is null. Similarly, if an object is null and you try to access or modify the field of that null object, this error will occur. See the following section for learning how this error generates and how you may fix it.Īn example of generating with integer object The exception will also be thrown if you try to take the length of an array which is null. Looking at the title of this article, if you have started associating it with Null Pointers, I would urge you against doing that. In this simple example, an instance of the Integer class is created and assigned it null. public class NullPointerException extends RuntimeException. Null Pointer Exception has nothing to do with Null Pointers. Thrown when an application attempts to use null in a case where an object is required. These include: Calling the instance method of a null object. Accessing or modifying the field of a null object. The occurs when a java variable does not point to any object and is accessed for any operation. Null Pointer Exception Null Pointer Exception occurs when Null reference is used in place where the requirement is for an object reference. The java NullPointerException occurs when a variable is declared but is not assigned to an object until you try to use the variable. ![]() An int type (primitive) variable is declared and this is assigned the instance method of that null Integer object. ![]()
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